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