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