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