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