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