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