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