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