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