One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,14)(8,12)(9,18)(10,13)(11,17)(15,20)(16,19) involution — undirected(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,22,25,29)(23,27,30,35)(24,26,32,28)(31,33,36,34)(1,2,3,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(22,26)(23,30)(24,32)(27,34)(28,29)(33,35)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(21,23,25,30)(22,27,29,35)(24,31,32,36)(26,33,28,34)(7,17)(11,14)(15,16)(19,20)(22,26)(24,32)(27,33)(28,29)(31,36)(34,35) involution — undirectedA 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.