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