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