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)(14,20)(16,18)(17,19)(21,22)(23,26)(24,27)(25,28)(29,36)(30,34)(31,33)(32,35) involution — undirected(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(21,23,24,30)(22,26,27,34)(25,29,32,31)(28,36,35,33)(1,2,3,4)(22,27)(23,29)(25,32)(26,33)(30,31)(34,36)(6,11)(10,13)(12,19)(18,20) involution — undirected(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)(22,27)(23,29)(25,32)(26,33)(30,31)(34,36)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.