One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10,13,16)(11,14,18,22)(12,15,20,24)(17,21,19,23)(25,26)(27,33)(28,42)(29,35)(30,36)(31,46)(32,37)(34,44)(38,48)(39,49)(40,55)(41,50)(43,56)(45,52)(47,53)(51,54)(2,6)(7,8)(9,11)(10,14)(12,19)(13,18)(15,23)(16,22)(17,20)(21,24)(25,27)(26,33)(28,43)(29,38)(30,39)(31,40)(32,41)(34,51)(35,48)(36,49)(37,50)(42,56)(44,54)(45,53)(46,55)(47,52) involution — undirected(1,3,5,4)(2,7,6,8)(9,12)(10,15)(11,17)(13,20)(14,21)(16,24)(18,19)(22,23)(25,28)(26,34)(27,38)(29,32)(30,44)(31,45)(33,47)(35,36)(37,52)(39,53)(40,54)(41,43)(42,46)(48,55)(49,56)(50,51)(1,4,5,3)(2,8,6,7)(12,20)(15,24)(17,19)(21,23)(25,29,32,28)(26,35,37,42)(27,38,41,43)(30,44,31,45)(33,48,50,56)(34,46,52,36)(39,54,40,53)(47,49,51,55)(11,18)(14,22)(17,19)(21,23)(25,30,32,31)(26,36,37,46)(27,39,41,40)(28,44,29,45)(33,49,50,55)(34,35,52,42)(38,53,43,54)(47,56,51,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.