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