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