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