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