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