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