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