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