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