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