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