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