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