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