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