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