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