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