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