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