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