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