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