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