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