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