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