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