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