One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,9)(4,12)(7,10)(8,13)(15,16)(17,18)(19,27)(20,31)(21,36)(22,24)(23,29)(25,34)(26,33)(28,43)(30,47)(32,42)(35,44)(37,41)(38,45)(39,48)(40,46) involution — undirected(1,2,5,8)(3,10,9,15)(4,13,12,6)(7,14,16,11)(19,28)(23,38)(27,43)(29,45)(30,37)(32,48)(39,42)(41,47)(17,19,22,28)(18,23,24,38)(20,32,35,48)(21,37,33,30)(25,41,40,47)(26,42,36,39)(27,44,43,31)(29,46,45,34)(1,3,5,9)(2,7,8,16)(4,14,12,11)(6,15,13,10)(18,24)(23,38)(25,40)(26,36)(27,43)(31,44)(39,42)(41,47)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.