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