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