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