One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,7,8,6)(9,10,13,16)(11,14,18,22)(12,15,20,24)(17,21,19,23)(25,26)(27,35)(28,33)(29,45)(30,31)(32,40)(34,37)(36,49)(38,53)(39,46)(41,47)(42,56)(43,52)(44,51)(48,54)(50,55)(1,3)(2,6)(4,7)(5,8)(9,11)(10,14)(12,19)(13,18)(15,23)(16,22)(17,20)(21,24)(26,31)(27,36)(28,41)(34,45)(39,40)(43,44)(48,50)(53,56) involution — undirected(1,2,5,4)(3,6,8,7)(9,12)(10,15)(11,17)(13,20)(14,21)(16,24)(18,19)(22,23)(25,27,37,39,30,36,29,40)(26,32,45,49,31,46,34,35)(28,42,43,54,41,38,44,55)(33,50,51,53,47,48,52,56)(1,4,5,2)(3,6,8,7)(12,20)(15,24)(17,19)(21,23)(25,28)(26,33)(27,38)(29,44)(30,41)(31,47)(32,48)(34,52)(35,53)(36,42)(37,43)(39,55)(40,54)(45,51)(46,50)(49,56)(10,16)(11,18)(15,24)(17,19)(25,29,30,37)(26,34,31,45)(27,39,36,40)(28,43,41,44)(32,49,46,35)(33,51,47,52)(38,54,42,55)(48,53,50,56)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.