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