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