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