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