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)(28,32)(29,42)(30,33)(31,39)(34,37)(36,47)(38,48)(40,46)(41,53)(43,50)(44,52)(45,51)(49,55)(54,56)(1,3)(2,6)(4,7)(5,8)(9,11)(10,14)(12,19)(13,18)(15,23)(16,22)(17,20)(21,24)(27,36)(31,43)(35,47)(38,49)(39,50)(44,54)(48,55)(52,56) 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)(25,27,37,50,30,36,29,39)(26,31,42,47,33,43,34,35)(28,38,51,56,40,49,41,52)(32,44,53,55,46,54,45,48)(1,2,5,4)(3,7,8,6)(12,20)(15,24)(17,19)(21,23)(25,28,30,40)(26,32,33,46)(27,38,36,49)(29,41,37,51)(31,44,43,54)(34,45,42,53)(35,48,47,55)(39,52,50,56)(1,4,5,2)(3,7,8,6)(10,16)(11,18)(15,24)(17,19)(26,33)(27,36)(28,40)(34,42)(39,50)(41,51)(44,54)(48,55)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.