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