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