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