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