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)(21,22)(23,25)(24,29)(26,31)(27,32)(28,30)(33,35)(34,36) involution — undirected(5,7)(6,11)(8,15)(9,16)(10,17)(12,19)(13,14)(18,20)(21,23,27,30)(22,28,32,25)(24,26,31,29)(33,34,36,35)(1,2,3,4)(5,8,10,9)(6,12,13,18)(7,15,17,16)(11,19,14,20)(21,24,25,35,27,31,28,34)(22,29,23,33,32,26,30,36)(5,9,10,8)(6,12,13,18)(7,16,17,15)(11,19,14,20)(21,25,27,28)(22,30,32,23)(24,35,31,34)(26,33,29,36)(7,17)(11,14)(15,16)(19,20)(21,26,25,36,27,29,28,33)(22,31,23,34,32,24,30,35)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.