One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,16)(12,14)(13,15)(17,18,22,26)(19,20,25,24)(21,27,30,31)(23,28,32,29)(1,3)(2,5)(4,8)(6,7)(17,19,22,25)(18,24,26,20)(21,32,30,23)(27,28,31,29)(9,11,13,12)(10,14,15,16)(17,20,23,31,22,24,32,27)(18,25,28,21,26,19,29,30)(2,6)(5,7)(18,26)(20,24)(27,31)(28,29) involution — undirected(3,8)(5,7)(9,12,13,11)(10,14,15,16)(17,21,32,25,22,30,23,19)(18,27,29,24,26,31,28,20)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.