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