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