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