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)(19,20,29,31)(21,32,27,26)(23,30,28,25)(1,3,4,8)(2,5,6,7)(9,10)(11,13)(12,14)(15,16)(17,19,27,30,22,29,21,25)(18,23,32,31,24,28,26,20)(2,6)(3,8)(9,11,12,15)(10,13,14,16)(17,18)(19,28)(20,30)(21,26)(22,24)(23,29)(25,31)(27,32)(2,6)(3,8)(10,14)(13,16)(18,24)(20,31)(23,28)(26,32) involution — undirected(2,6)(5,7)(17,20,27,23,22,31,21,28)(18,25,32,19,24,30,26,29)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.