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