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)(11,14)(12,13)(15,16)(18,24)(20,26)(21,22)(25,28)(27,32)(30,31) involution — undirected(2,5)(6,8)(17,18,22,20,23,26,21,24)(19,27,31,28,29,25,30,32)(10,13)(14,16)(17,19,23,29)(18,25,26,27)(20,32,24,28)(21,30,22,31)(1,3,4,7)(2,6,5,8)(17,20,21,18,23,24,22,26)(19,28,30,27,29,32,31,25)(9,11,12,15)(10,14,13,16)(19,29)(25,27)(28,32)(30,31)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.