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