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