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