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