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