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