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