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