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