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