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