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