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