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