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