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)(20,25)(21,26)(22,31)(23,29)(24,28)(30,32) involution — undirected(2,6)(4,7)(9,10)(11,15)(12,14)(13,16)(17,19,21,29)(18,23,26,27)(20,30,22,28)(24,31,32,25)(1,3)(2,7)(4,6)(5,8)(9,11)(10,13)(12,16)(14,15)(17,19,21,29)(18,24,26,32)(20,28,22,30)(23,31,27,25)(2,6)(3,8)(11,16)(13,15)(17,19)(18,23)(20,30)(21,29)(22,28)(24,25)(26,27)(31,32) involution — undirected(1,4,5,7)(2,3,6,8)(10,14)(13,15)(17,20,21,22)(18,25,26,31)(19,28,29,30)(23,32,27,24)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.