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