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