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