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