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