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