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