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