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