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