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