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