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