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