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