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